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Jordan Goodman Named Winner of Yodh Prize

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Category: Department News
Published: Wednesday, May 24 2017 10:28

Distinguished University Professor Jordan Goodman has been named the winner of the 2017 Yodh Prize for “outstanding leadership in the development of water Cherenkov instruments in high-energy gamma-ray astronomy”. The prize was awarded at the 35th International Cosmic Ray Conference 2017 (ICRC2017) in Busan, South Korea.

Goodman is currently the U.S. scientific spokesperson and PI for the High Altitude Water Cherenkov experiment (HAWC) in the Sierra Negra mountains of Mexico. Previously, he was co-spokesperson/PI for the MILAGRO Gamma Ray Experiment in New Mexico, where he and his collaborators developed a detector designed to measure the energy and arrival direction of gamma and cosmic rays via Cherenkov radiation in massive vats of water.

In addition, Goodman has worked on the IceCube South Pole Neutrino Observatory and the Super-Kamiokande Neutrino Experiment in Japan. Physics World named IceCube the 2013 Breakthrough of the Year for making the first observations of cosmic neutrinos. The Super-K experiment proved that neutrinos have mass and was the basis of Takaaki Kajita’s 2015 Nobel Prize in Physics and the 2016 Breakthrough Prize, which was shared by the collaboration including Goodman and UMD Professor Greg Sullivan and UMD Research Scientist Erik Blaufuss.

The Yodh prize was endowed by Gaurang and Kanwal Yodh to the University of California Irvine Foundation in 1998 and is given out bi-annually at the International Cosmic Ray Conference. Professor Yodh, a noted astrophysicist, received his Ph.D. at the University of Chicago, working under Enrico Fermi, and before settling at UCI was a professor at UMD, where he oversaw Goodman’s graduate work. Yodh’s many research contributions include extracting rising proton-air cross sections from the analysis of cosmic ray data and developing early transition radiation detectors for particle detection. He is a Fellow of the American Physical Society, the American Association for the Advancement of Science, and the UK Institute of Physics. Yodh is also an accomplished sitar player, and while in College Park offered a course in Indian classical music performance that helped launch the UMD ethnomusicology program. 

Senior Gregory Ridgway Named University Medalist

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Category: Department News
Published: Monday, May 22 2017 14:27

Gregory Ridgway. Photo by John T. Consoli.Gregory Ridgway. Photo by John T. Consoli.

From publishing in physics journals to performing at an international piano festival in Italy, Gregory Ridgway’s talents are as diverse as his experiences at UMD.

Graduating with a 3.98 GPA and three degrees—in physics, mathematics and piano performance—Ridgway’s ability to think both logically and creatively will be the foundation of his ambition to become a theoretical physicist.

“There are so many different ways to look at the world,” he says. “I could never just settle into one.” 

A recipient of Banneker/Key and National Merit scholarships, the native of Silver Spring, Md., has applied himself on and off campus in the arts. An organist, Ridgway works as director of music at Ager Road United Methodist Church in Hyattsville, and performed at the Amalfi Coast Music and Arts Festival and the International Keyboard Institute and Festival. He played with the Baltimore Symphony Orchestra and participated in UMD’s Music and Film series, which sets new scores to old silent films.

“I’ve been treated very well by Maryland,” Ridgway says. “If I had the desire, they had the resources.”

He began taking graduate classes as a junior, and helped author four articles published in Physical Review D and the Journal of High Energy Physics. Ridgway worked mostly in lattice physics, which explores concepts such as subatomic forces, neutron stars and the dynamics of the early universe.

“The daily interaction with someone of Greg’s breadth of culture is a joy in itself,” says UMD physics professor Paulo Bedaque. “One should ‘discover something, learn something and teach something every single day.’ I know no student who embodies this spirit better than Greg.”

The National Science Foundation awarded a graduate research fellowship to Ridgway, who will pursue a doctorate in physics at the Massachusetts Institute of Technology. He hopes to one day make an important contribution to science and has found great joy working alongside brilliant people who are painstakingly doing the incremental progress necessary to understanding our world.

“I love the work,” he says. “Each small problem we solve deserves a celebration.”

Writer: Liam Farrell

University of Maryland
College of Computer, Mathematical, and Natural Sciences
2300 Symons Hall
College Park, MD 20742
www.cmns.umd.edu
@UMDscience

Original story.

Labs IRL: Boxing up atomic ions

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Category: Research News
Published: Saturday, May 13 2017 11:15

What makes a university physics lab tick? Sean Kelley grabs a mic and heads to a lab that's trying to build an early quantum computer out of atomic ions. Marko Cetina and Kai Hudek, two research scientists at the University of Maryland who run the lab, explain what it takes to keep things from burning down and muse about the future of quantum computers.

Read more.

Tiny tug unleashes cryogenic currents

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Category: Research News
Published: Tuesday, May 09 2017 11:56

A crystal of samarium hexaboride sits suspended between two titanium supports. (Credit: A. Stern/UCI)

Researchers have found that a small stretch is enough to unleash the exotic electrical properties of a newly discovered topological insulator, unshackling a behavior previously locked away at cryogenic temperatures.

The compound, called samarium hexaboride, has been studied for decades. But recently it has enjoyed a surge of renewed interest as scientists first predicted and then discovered that it was a new type of topological insulator—a material that banishes electrical currents from its interior and forces them to travel along its periphery. That behavior only emerges at around 4 degrees above absolute zero, though, thwarting potential applications.

Now, experimentalists at the University of California, Irvine (UCI), working with JQI Fellow Victor Galitski and former JQI postdoctoral researcher Maxim Dzero (now at Kent State University), have found a way to activate samarium hexaboride's cryogenic behavior at much higher temperatures. By stretching small crystals of the metal by less than a percent, the team was able to spot the signature surface currents of a topological insulator at 240 K (minus 33 C)—nearly room temperature and, in any case, a far cry from 4 K. The currents even persisted once the strain was removed.

Their technique, which was recently reported in Nature Materials, uses piezoelectric elements that bend when they are fed with an electric current. By suspending a sample of samarium hexaboride between two titanium supports and pulling on one side, researchers could measure the crystal's electrical properties for different temperatures and amounts of stretch.

Last year, Galitski partnered with the same experimental group at UCI and discovered a potential application for samarium hexaboride's unusual surface currents. They found that holding a small crystal at a fixed voltage could produce oscillating currents on its surface. Such tick-tock signals are at the heart of modern digital electronics, but they typically require clocks that are much larger than the micron-sized crystals.

The new result might make such applications more likely, and it could even be achieved without any piezo elements. It may be possible to grow samarium hexaboride as a thin film on top of another material that would naturally cause it to stretch, the researchers say.

REFERENCE PUBLICATION
"Surface-dominated conduction up to 240K in the Kondo insulator SmB6 under strain," A. Stern, M. Dzero, V.M. Galitski, Z. Fisk, J. Xia, Nature Materials, advance online publication, – (2017)

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RELATED JQI ARTICLES
Oscillating currents point to practical application for topological insulators
An Ideal Material
Topological Insulators

More Articles ...

  1. Physics Staff Awards
  2. Christopher Monroe Enters National Academy of Sciences
  3. Trapped ions and superconductors face off in quantum benchmark
  4. Three UMD Students Named 2017 Goldwater Scholars

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